package com.sky.interceptor;

import com.sky.constant.JwtClaimsConstant;
import com.sky.context.BaseContext;
import com.sky.properties.JwtProperties;
import com.sky.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.logging.Handler;

/**
 * 用户端jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenUserInterceptor implements HandlerInterceptor {
    @Autowired
    private JwtProperties jwtProperties;

    /**
     * 检验jwt令牌
     * @param request
     * @param response
     * @param handler
     * @return
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,Object handler){
        //判断当前拦截的是controller的方法还是其他资源
        if(!(handler instanceof HandlerMethod)){
            return true;
        }

        //1.从请求头中获取令牌
        String token =request.getHeader(jwtProperties.getUserTokenName());

        //2.检验令牌
        try {
            log.info("jwt令牌检验：{}",token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getUserSecretKey(),token);
            Long userId =Long.valueOf(claims.get(JwtClaimsConstant.USER_ID).toString());
            log.info("当前用户的id：",userId);
            BaseContext.setCurrentId(userId);
        //3.通过，放行
            return true;
        } catch (Exception e) {
            //4.不通过，响应401状态码
            response.setStatus(401);
            return false;
        }
    }
}
